A1200 with timer failure on CIA-A (u7) with amiga test kit (ATK). Removed CIA (U7) Placed PLCC44 socket and new CIA Result.. Timers are working again.
bL0g
Amiga 500 rev 6A – Green boot screen
I have an Amiga 500 revision 6A, with a green boot screen. I suspected Fat Agnus, so I replace it. After the swap I started ATK (Amiga Test Kit) but it didn’t detect any memory at all. DIAGROM did detected 256KB Chip RAM, but failed to test it after 256KB RAM. I measured all the […]
Capacitor leakage – look under surrounding components
If a capacitor has been leaking, always look under surrounding components. Sometime it looks there is no residue under a nearby component, but you can’t see it. In the picture below you see some vias that have been exposed to leaken electrolyte for some while, and are starting to corrode. At one moment the traces […]
Amiga 1200 – Gayle Away..
An Amiga 1200 came in for repair, doesn’t boot and the Floppy drive LED is always on. After some inspections I found the problem, there is a crack in the Gayle chip. Flir images of the board to see if more chips are getting hot.. no abnormalities.. Removed gayle, under the chip 3 of the […]
Marantz – SR7002 – blinking standby led
I fixed a Marantz SR-7002 from a friend of mine. The device had a blinking Standby LED at a interval of 500ms (p14 Service manual). Day 1 The relays where not switching to turn on the amplifier power, so the first thought was that there was a problem with the standby PCB. Tested serveral […]